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NeXtMidas Training
Primitives
Open, Process, Close
open()
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- The
open() method.
- Should handle all initialization.
- This includes getting any command-line parameters or switches.
- Do not initialize in a constructor.
- This will cause problems if the primitive needs to be restarted.
(More on this later.)
- NeXtMidas uses reflection to call primitives. If the constructor takes in
any arguments, NeXtMidas won't know how to call it.
- Primitives should not even have a constructor declared.
- Should open any files used.
- If a pipe is opened in
process() , there may be data loss.
- Should return one of the following:
NORMAL |
Normal operation, ready for process() . |
FINISH |
Nothing to process, skip to close() .
(This is rarely used.) |
- Example of using
FINISH : A primitive that takes in
a list of files to process may return FINISH if no
files are given. |
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